A -> C

You: "Why does the option you mentioned makes it impossible to be sad unless you choose it?"

Him: "Because when all things which are normally thought of as opposites are thought of as the same thing and opposites in parallel, this allows to understand all of reality. And if you understand it, you contain its wills. And then, there's no reality will be against your will - althought you can choose to "reduce" yourself so there will be conflict"

What to answer?

a. Since when does reality has wills?

b. Why would understand something make you contain all its wills?

c. How is it possible to "reduce" yourself like that?